'Tap' was completely useless. The thread to the fitting that goes beneath the sink was tapered, meaning the tap was literally flapping in the wind and could not be tightened without breaking the plastic nut. Had to get my own part manufactured to cure the problem (fortunately I have an engineer in the family) and although I didn't ask for a refund, as with a great deal of effort and some expenditure I resolved the problem myself the company didn't even bother responding with a sorry.